Tests/RunCMake/FASTBuild/UnityBatchSize.cmake - third_party/github.com/Kitware/CMake - Git at Google

 set(CMAKE_UNITY_BUILD ON)
 set(CMAKE_UNITY_BUILD_BATCH_SIZE 2)
 add_executable(main main.cpp some_source_file_1.cpp some_source_file_2.cpp some_source_file_3.cpp)
	set(CMAKE_UNITY_BUILD ON)
	set(CMAKE_UNITY_BUILD_BATCH_SIZE 2)
	add_executable(main main.cpp some_source_file_1.cpp some_source_file_2.cpp some_source_file_3.cpp)